Re: Info on spark pluge

Posted by 55PackardGuy On 2014/6/24 22:18:33

Thanks for the info on heat range. I suspected the "45"s might be a bit "cooler" but could not find an AC "46" heat range.

Could the gap --either larger or smaller-- help the colder plug to perform better? I imagine they'll foul quicker than a "hotter" plug, probably the reason that the former owner had two sets-- one to run with and one to clean.

For my purposes, they'll probably be OK, and they weren't expensive... about 2 bucks apiece.

I haven't installed them yet, and might hold out for a more o.e. type plug if I can find a set. I've had good luck with Auto-Lite in other vehicles, and if the 308 is available, they may be worth trying first.

Even though Champion was specced, I guess everybody knows Champion's current reputation-- bad. I don't even know if I could get a Champion J8 or crossover number, nor would I probably want one.

I think I've got Auto-Lite ignition so the Auto-Lite would be more "correct" in a way than AC Delco, although being correct is not my main goal--drivability and starting are.

That said, with the R45 AC plugs in there now--although cruddy and probably not gapped very well--the darn thing starts like it has electronic ignition.

I hope this discussion helps the original poster. Even something as simple as a spark plug has a learning curve in this blasted hobby.

And what about those rings? Leave them or toss them?